using System;
using System.IO;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Numerics;
using System.Diagnostics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;
using static System.Console;


namespace yukicoder
{
    class Program
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            var ans = Enumerable.Range(0, 10);

            for (int i = 0; i < n; i++)
            {
                var s = Console.ReadLine().Split().ToArray();
                var flg = s[4];
                var chk = s.Take(4).Select(x => int.Parse(x));

                if ("YES".Equals(flg))
                {
                    ans = ans.Intersect(chk);
                }
                if ("NO".Equals(flg))
                {
                    ans = ans.Except(chk);
                }
            }

            Console.WriteLine(ans.First());

        }
    }
}